Tzikas,
A Balun at the antenna end and Ferrite at the shack end should help with RF
riding the coax cable into the shack. Build the balun to transform the
impedance at the antenna feed point to that of the impedance of the coax. I
don't understand what is meant by "metal house", but a 2.5M coax puts the
equipment kind of close to the antenna though. Don't know if that would be
a part of the issue or not. Last observation would be 1 ground rod. May not
be enough for a good RF ground, but should work great for DC. One question,
how is the PLL, Amp & Power supply grounded?
I think someone already mentioned a good type of audio cable to use, one
with a braided shield and or foil wrap. I use a cable that has two twisted
pairs surrounded by a very heavy braided shield for all of my audio
connections between gear. Here is a hyper-link, maybe you will be able to
find a distributor in your location:
http://www.canare.com/ProductItemDisplay.aspx?productItemID=53
73,
Mike
W5CUL
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Jim Thomson
Sent: Saturday, October 30, 2010 12:20 AM
To: amps@contesting.com
Subject: Re: [Amps] use or not coaxial audio cable to transmitter's
### He posted a diagram in his 4th posting. His coax to vertical on roof
is just 2.5M long.
He also has 9 M of grnd wire from metal to the dirt. He has a xcvr + 500
w amp. He probably
requires ferrite at both the base of the vertical..and also in the shack....
IE: both ends of the coax.
http://tzitzikas.site90.net/files/installation.JPG
Jim VE7RF
On 10/29/2010 9:20 AM, tzikas tzik wrote:
> pll= phase lock loop . This equipment keep the frequency of oscillator
> stable
Understood. But more questions.
You say 500 watt transmitter. Most ham transmitters are 100W output, and
if you want more power, you add a power amplifier. Is this a 500W
transmitter all in one box, or two boxes?
Where does this cable run? Inside the transmitter, from one point to
another, or outside the transmitter, between boxes? What is the
transmit frequency?
What kind of cable is it? Coax or two conductors plus shield? What
kind of shield? What kind of circuit is connected to the cable at each
end? Balanced or unbalanced? Where is the shield connected?
73, Jim K9YC
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